On October 5, 2026, HLN released a new version of the open-source Immunization Calculation Engine (ICE) software with updates to COVID-19, meningococcal B, pneumococcal, and yellow fever vaccine logic, along with an upgrade to the core service.
What’s New in ICE
COVID-19:
- Updated Skip Dose Rule logic in the Seasonal 2-dose Series (< 2 years) to support prior-season CVX 334 doses.
- Ensured the 52-day absolute minimum interval, when needed, is calculated from the last non-ignored shot on record.
- Corrected an issue affecting patients who transitioned from the Seasonal 1-dose Series (2–64 years) to the Seasonal 2-dose Series (≥ 65 years) during the prior season.
Meningococcal B:
- Corrected the previously reported MenB 4C series selection issue involving CVX 163 followed by CVX 164.
Pneumococcal:
- Updated PCV21 logic to reflect current guidance, including removing this CVX from the pediatric series and updating its absolute minimum age.
Yellow fever:
- Updated live vaccine interval logic and supplemental text to reflect the 28-day, rather than 30-day, interval indicated in the 2026 CDC Yellow Book.
Core service:
- Upgraded ICE to Drools 10.2.
See the latest logic updates in action using CDS Insight, a free tool to simulate patient scenarios and receive immunization evaluations and forecasts based on the latest ICE rules.
For additional details, see the Release Notes and download ICE v2.60.1 today. Questions? Please reach out to the ICE team at ice@hln.com.